async function async1() {
    console.log("async1 start");
    await async2();
    console.log("async1 end");
    setTimeout(() => {
        console.log('timer1')
    }, 0)
}
async function async2() {
    setTimeout(() => {
        console.log('timer2')
    }, 0)
    console.log("async2");
}
async1();
setTimeout(() => {
    console.log('timer3')
}, 0)
console.log("start")

/*
? async1 start
? async2
? start
? async1 end
? timer2
? timer3
? timer1

 */
